Electric heater for liquids.



PATENTED PEB. 13, 1906.

G. E. STEVENS. ELECTRIC HEATER FOR LIQUIDS.

APPLICATION FILED JULY 19,1904.

A Mk1 Inventor, sorge E Stevens Witnesses:

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UNITED STATES.

PATE@ GEORGE E. STEVENS, OE LYNN, MASSACHUSETTS, ASSleNORPTelGENERALELECTRIC COMPANY, A CORPORATION OE NEWl YORK.

ELECTRIC HEATER FOR LIQUIDS.

Specification of Letters Patent.

Patented Feb. 13, 190e. f

Application ned July 19, 1904. sain No. 217,21a`

To all whom, it may concern:

.Be it known that I, GEORGE E. STEVENS, a citizen of the United States,residing at Lynn, county of Essex, State of Massachusetts, have inventedcertain new and useful Improvements in Electric Heaters for Liquids, ofwhich the following is a specification.

The present invention relates to electric heaters of the type em loyedin heating and boiling liquids for coo ng and similar purposes; and ithas for its object to produce a device which is simple and compact instructure and efficient in operation. To this end I preferably employ aresistance unit of compact structure which may be heated to a hightemperature without deterioration and incase the same in an envelop ofmetal, which is adapted to project into the liquid to be heated. Theunit is preferably closely fitted Within the envelop, so as to be ingood heatconductive relation thereto, and the leads are brought outthrough one end of the envelop, the lead from the distant end referablyextending through the center of t e unit. It is obvious that a unit ofthis type may be used in various relations, either independent of or infixed relation to a liquid-containing recep- In the present applicationI have illustrated one embodiment of the invention consisting of asimple water-heater in which the unit-containing envelo is formedintegral with the receptacle an the circuit-leads extend out through thehandle.

The nature of my invention will be better understood by reference to thefollowing descrip tion, taken in connection with the accompanyingdrawings, and its scope will be particularly pointed out in the appendedclanns.

In said drawings, Figure 1 1s aside eleta'4 tion of said water-heater,embod 1 the features of my invention. `Fig.2i acentral section throughthe same. Fig. 3 is a bottom view illustrating particularly the meansfor holding the parts in place. Fig. 4 is a fragmentary view similar toFig. 2 of the modification; and Fig.' 5- is a detail view of saidmodification, illustrating the means for clam ping the handle inposition.

Referring in detail to the drawings, 10 designates the receptacle forthe liquid, which may be of an preferred form and is here shown as a cyindrical cup provided-with a over a tube 15 of flange 11, whichconstitutes a supportingbase. Located centrallywithin this cup andextending through an opening in its bottom 55A is the heating member 12,which is preferably '.f tubular in shape, with its upper end closed f""'j and its lower end firmly secured to the bot` i tom of thereceptacle, so as to lprovide awateri tight joint. The lower end of thisVInernbe 12 is left open, so that the heating unit 13 in@ be readilyslipped into and out of plaee'.. unit ma beef any preferred form;preferably consists of a helicall eonduotiil d, ribbon 14, wound. onedge withl its con 1U; 5 tions insulated from each otherand'f th teriorof the heating member 12,*by'a`1w1yT able insulation, but preferably a,refract insulationfor instance, one composed kaolin and silicate ofsoda. Inl the preser W stance this coil of conducting-ribbon is slippeorcelain or otherbspirnilr insulating materia provided with a flange atits lower end, upon which thej IlibbQQ firmly seated. In assembling, asuitablejlea 7 5 17 is connected to the lower end of the ance-conductorbefore the same is passed over@y f tube 15, said lead having first beenassedthrough an opening 18 in the lower en of the tube communieatlngwith a longitudinall .86 groove 19, which extends throughout the flength of the tube. The conductor may then be slipped into place uponthe tube 15, and the connection between the lead 17 .and l the conductor14 will pass down through the '8'5 groove 19 and when in nal positionwill be located within the winding 13 in a rotectedfposition. The otherterminal 20 1s passed E i throu h the center of the tube 15 and throughK a smaIl opening 21 in a conducting-disk 2.2 atl 99 I the upper endOfthe Winding, suitable elecey n trical connections being made betweensaidy lead 20 and the disk 22 and said disk and the upper end of thehelical winding 14. With this construction the unit 13 may be readily 95slipped into position in the heating member 12 or drawn out for thepurpose of re air.

The unit 13 is preferably heldv in p ace by means of a cap 23, which isremovably fitted into the lower end of the tubular member 12. 'lhis capis rovided with an opening at one side, throug which extends a hollowstem 24, which passes laterally through the flange 11 and then upwardand outward, sogas to form,

IOO

a handle for the rece"tacl, the outer end of the stem being provi edwith a gri i 25. The hollow stem 24 serves as a duct ier thereistanee-leads 17 and 20, which are suitably insulated from each otherand the interior of the tube. The parts are iirmly held in lace by meansof an apertured plate 26, whicli engages at one end with an inlurnedportion 27 on the flange 11 and at its opposite end is held in place b ascrew 28, which passes through the shel of the stem 24. It is obviousthat the parts may be held in place by other means. In Figs. 4 and 5 Ihave shown a modification in which the base 11a of the receptacleconsists of a casting into which the shell 10u of the receptacle isseated and through which the lower end of the stem 24a is Securely heldby reason of the reater thickness of the metal at the point t ough whichthe stem asses. The u per end of the stem 24*l is he d in lace by a siding member 30, which is rovidbd with oppositely-extendin win s w 'chpass under the clips 31, secure to t e shell of the receptacle. Thewings of the sliding member 3() `tre provided witb projecting portionswhich engage coperating de ressions in the clips 31 and can be removetherefrom only by springing said wings out of enga ement therewith.

It will be apparent rom the above that at any time the stem 24 or^24 andthe cap 23A may be removed for the purpose of wi thdrawing theresistance unit 13. It will also be apparent that the heatin(y member12, which is practically surrounded by the liquid to be eated, is ingood heat-conductive relation to the 4resistance-winding 14 and thatsaid member by reason of its smooth exterior permits the receptacle tobe readily cleaned.

It is obvious that the heating member 12 might also project into theliquid from any of the other walls ofthe receptacle than the bottom andthat the same might be greatly varied in shape Without departing fromthe spirit and scope of the present invention; but it is desirable thatthe same should be of such shape that the heating unit may be withdrawnfor the purpose of repair. It is also desirable that the shape of theheating unit be similar to that of the interior of the heating member 12in order that the resistanceeonductor may be brought into goodconductive relation to said member. In the use of the device the levelof the liquid should normally be above the upper end of the heatingmember 12 in order to prevent the unit from becomin unduly heated,thereby failing to utilize fu ly its energy.

Many uses ofthe construction of the heating unit and inclosing envelopherein disclosed will be suggested to those skilled in the art asfalling wit `n the spirit and scope of the present invention. Manyalterations and modieations may also be made in said structure withoutdeparting from the spirit and scope of the invention I therefore do notwish to be limited to the specifiquses or to the specific constructionherein disclosed.

That I claim as new, and desire to secure by Letters Patent of theUnited Statesis,

1. An electric heater comprising a receptacle, a hollow heating memberextending upward from the bottom of the receptacle and open to theexterior of the receptacle at its lower end, an electric heating unitadapted to be inserted in and withdrawn from said member and having itsresistance el'ement in intimate thermal relation to the walls of saidmember, a lead extending from the upper end of the unit down throuvh itscenter, and a second lead secured to the lower end of said unit.

2. An electric heater comprisin tacle adapted to contain a liquid toeheated, a closed rentrant metallic tube extending upward from the bottomof said receptacle, a resistance unit mounted in said tube in goodheat-conductive relation to the walls thereof, the resistance beingprovided with a joint within the tube below the normal liquid level toprevent burning out.

3. In an electric heater, a hollow `heating member adapted to extendinto the liquid to be heated, an ,edgewise wound reslstance unit locatedtherein in heat-conductive relation to the walls thereof, comprisin@` ac entral insulating-tube provided with a ange at one end upon which saidresistance-winding is seated, a conducting-disk connected tothe oppositeend of said wmdin and resting upon the opposite end of said tu e, a leadsecured to said disk and extending through said tube, and a second leadsecured to the outer end of the resistance unit.

4. An electric heater comprising a receptacle, a hollow tubular memberwithin the recep tacle extending upward through its bottom a recep- IOOand closed at its upper end, an electric heating unit therein,comprising a heating-.coil in close heat-conductive relation therewith,and means for removably holding said unit within said member.

5. An electric heater comprisin T a receptacle, a hollow tubular memberwithin the receptacle extending upward through its bottom and closed atits upper end, an electric heating unit therein, comprising a coilcorresponding in shape with said tubular member and in closeheat-conductive relation therewith means for rem v,vably holding saidunit within said member, said means comprising a cap, a duct engagingtherewith and ccmmumcating with the interior thereof, and a retainingmember e 0raging the base of said receptacle and secure to said duct.

6. An electric heater comprising a rece tacle, a hollow tubular memberwithin t e same extending upward through its bottom and closed at its uper end., a removable electric heating unit t ercin, a cap for closingIIC 1 trie heating unit t the lower end of said member, a duct com?munioating with the interior of said 'cap and extending outward to forma handle for said receptacle, and means for securing said cap and saibase of the receptacle, a cap or closing the lower end of said member, aduet engaging erein, a lanfge forming the said-"raap and eommunieatingwith the interior thereof and extending outward to form 15 a handle, andmeans for d duet in removable receptacle comrisin `enga ing said angeuct.

In witness whereof I have hereunto sald hand this 18th day ofJul 1904.

' Witnesses:

securing said cap relation with sald a retaining member base and securedto set my GEOR E E. STEVENS.

DUGALD MoK. MoKILLoP,

oHN A. MoMANUs.

